Fastener applying device



July 24, 1956 H. J. SPENCER 2,

FASTENER APPLYING DEVICE Filed March 15, 1954 5 Sheets-Sheet 1 IN VENTOR.

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July 24, 1956 H. J. SPENCER FASTENER APPLYING mzvxo's S Sheets-Sheet 2Filed March 15, 1954 IIZgENTOR.

y 1956 H. J. SPENCER 2,755,474

FASTENER APPLYING DEVICE Filed March 15, 1954 3 Sheets-Sheet 3 INVENTORzp ew FASTENER APPLYING DEVICE Herman J. Spencer, Ingomar, Pa.

Application March 15, 1954, Serial No. 416,213

Claims. (Cl. 1-49) The present invention relates to fastener applyingimplements and more particularly to plier type implements adapted to beheld and operated in one hand.

One object of the present invention is to provide an implement of thetype indicated having a magazine through which fasteners may be suppliedwhich has fastener applying arms positioned in relation to the magazineso as to leave the upper side of the latter accessible and a pivotedhand lever having a central portion overlying and movable towards theupper part of the magazine for urging the actuating arms to drive afastener.

Another object is to provide means between the hand lever and theactuating arms whereby the hand lever can be pivoted in reverse fastenerapplying direction away from the upper side of the magazine to giveaccess to the latter.

Another object is to provide an implement of the type indicated with ahand lever which is pivoted on the anvil member, overlies the magazineand has a shiftable contact with an irregular shaped cam on the driveractuating levers to provide extreme relative movement between the anvilmember and the magazine without reducing the effectiveness of the handlever to powerfully urge the actuating levers to drive long leggedfasteners.

Another object is to provide an implement of the type indicating withactuating arms pivoted or otherwise mounted on the magazine frame memberto thereby transmit a part of pressure applied on the actuating arms tothe magazine frame member to urge the latter to grip one side ofmaterial and a pivoted hand lever having an operable connection with theactuating arms for urging the latter in fastener applying direction.

Another object is to provide a novel means for holding the driving bladein operable contact with a driver head plate which is connected to theactuating arms.

Still another object is to provide means which prevents the driver frombeing retracted in relation to the magazine until a fastener has beencompletely ejected from the device.

Another object is to provide means at the loading end of the magazinefor releasably holding the pusher and for pivoting the latter to aninverted position to permit fasteners to be loaded into the device abovethe fastener pusher.

Further objects of the invention are set forth in the followingspecification which describes a preferred form of the implement asillustrated by the accompanying drawings. In the drawings Figure 1 is aside elevational view of a fastener applying implement showing thefeatures of the present invention and showing the manually operated handlever pivotally mounted on the anvil arm with its roller engaging thecam surfaces on the actuating arms;

Figure 2 is a longitudinal sectional view of the implement showing thespring for normally holding the actuating arms and anvil member inspaced relation to the magazine frame member with pressure on the handatent lever as having thereby moved the devices parts a slight amount infastener applying direction;

Figure 3 is a view similar to Figure 1 showing the actuating arms andanvil arm as actuated in relation to the magazine by the manuallyoperated hand lever to thereby drive and clinch a fastener while rigidpressure is being applied to the anvil arm and the magazine to urge thelatter arm and magazine to grip the material. Also shown is the bladeretainer as having been shifted longitudinally to thereby shift aportion of the full throw mechanism spring out of the slot in the headportion of the magazine;

Figure 4 is a plan view taken along line lV- IV of Figure 1 to show therelation of the parts with each other;

Figure 5 is a transverse vertical section taken along line V-V of Figure1;

Figure 6 is a plan view taken along line VI-.-VI of Figure 1 toillustrate the relative positions of the full throw mechanism parts inthe position shown in Figure 1;

Figure 7 is a plan view taken along line VII-VII of Figure 2 toillustrate the relative positions of the full throw mechanism parts inthe position shown in Figure 2;

Figure 8 is a plan view taken along line VIII-VIII of Figure 3 toillustrate the relative positions of the full throw mechanism parts inthe position shown in Figure 3;

Figure 9 is a view similar to Figure 1 but showing the hand lever ashaving been pivoted counter-clockwise in reverse fastener applyingdirection to a position which exposes the upper side of the magazine.The loading or rear end of the device is shown in section to illustratethe pusher as having been moved thereto and in its horizontal feedingposition;

Figure 10 is a transverse vertical section taken along line XX of theloading end of Figure 9 to illustrate the a io ip be e n e Par Figure 11is a side elevation of the loading end of the device with nearestsidewardly parts cut away to show the pusher as having been swung fromits horizontal feeding position to an inverted position to permitfasteners to be fed into the loading end of the device above the pusher;

Figure 12 illustrates a group of parts which are to be connectedtogether to form the assembled driver and the flat type spring which iscontrolled by one of the parts to keep the assembled driver from risingin relation to the magazine until a fastener has been completely drivenfrom the device;

Figure 13 is an isometric view of the staple pusher.

Referring to the drawings, the magazine 1 is of channel shape incross-section comprising a bottom wall 39 and parallel side walls 439extending upwardly therefrom as shown in Figures 1 and 5. A U-shapedhead 15 has a central portion 41 extending transversely and verticallyfor closing the front end of the magazine 1, the lower part of whichacts as the front wall of the driving throat 8. The central portion 41of head 15 has two vertical flanges 18 which extend longitudinallytowards the rear end and vertically above the side walls 40 of themagazine 1, the flanges fitting within and secured to the front ends ofthe side walls 401 of the magazine 1. The lower inwardly sides 17 offlanges 18 of head 15 act as the sideward walls of the driving throat 8.See Figure 5. The vertical flanges 18 of head 15 have aligned verticallyextending slots 14 with the vertical edge of one of flanges 18 having acam edge 42 near its uppermost end which slants upwardly towards therear end of the device and a distance downwardly therefrom has anupstanding hookshaped lug portion 44 extending towards the rear end ofthe device which has a second cam edge 43 on its lug portion 44 whichalso slants upwardly towards the Hold down brackets 45 are long rightangle shapedin cross-section and they are welded to the inwardly sidesof the side walls 40 of the magazine frame 1 with their short flangesextending towards each other and longitudinally substantially the fulllength of the device to overlie and restrict staple from movingupwardly. See Figures 2 and 5.

A staple guide 5 is U-shaped in cross-section having a bottom wall 46and upstanding parallel side walls 47 upon which U-shaped staples S maybe straddled to be fed therealong towards the front end of staple guide5 to the driving throat 8 for delivery to the applying means. The sidewalls 47 are pierced adjacent their front ends to receive thetransversely positioned pin 48 and the feeder spring pulley 49 ismounted on pin 48 between the side walls 47 of the staple guide 5. SeeFigure 2.

The side walls 47 of the staple guide 5 extend a short distance beyondthe rear end of its bottom wall 46 to form guides 50 which have beenevenly pressed towards each other a slight amount and have alignedlongitudinally extending slots 51 therein which are open towards thefront end of the staple guide 5 and are closed at their rearwardlypositioned depending hook-shaped ends 52.

The staple pusher 7 is of channel shape in cross-section having acentral web 53 and depending flanges 54 and is adapted to straddle theside walls 47 for moving staples S along and towards the front end ofthe staple guide 5. A finger grip 55 has a web section 56 which hasspaced apart parallel depending flanges 57 which are in parallelalignment with and spaced apart from the inwardly sides of the dependingflanges 54 of the staple pusher 7. See Figures and 13. Flanges 57 havealigned pierced holes 58 adapted to receive the enlarged central portionof pin 59 to position the latter transversely in the device. The upperside of the web 56 of the finger grip 55 is welded or otherwise securedto the under side of the central web 53 of the pusher 7 as shown inFigure 13 and it has a tab 60 formed upwardly to act as a finger gripfor retracting the pusher 7 when loading of the device is required. Itwill be noticed in Figure 10 that the ends 61 are of less diameter thanthe central portion of pin 59 and that ends 61 are adapted thereby tomove along the length of slots 51 and further that the larger centralportion of pin 59 prevents the latter from moving transversely inrelation to the guide 50 when ends 61 are in slots 51. It will also benoticed in Figure 10 that the pin 59 is only slightly less in lengththan the space between the side walls 47 of the staple guide 5 and pin59 can therefore move longitudinally but is restricted from movingtransversely in relation to the staple guide 5.

The feeder spring 6 has one end 62 held on lug 63, the latter beingformed upwardly from the bottom wall 46 of the staple guide 5 adjacentto the latters rear end, and spring 6 is brought upwardly around pulley49 with its other end 64 being brought back to overlie its lower strand.The feeder spring end 64 is placed between the depending flanges 57which are attached to the pusher 7 and pin 59 while passing through acoil of spring end 64 of the feeder spring 6 is entered into holes 58 offlanges 57 with ends 61 of pin 59 protruding transversely outwardly fromthe outwardly sides of flanges 57. The pusher 7 is held vertically atright angle to its horizontal feeding position on the staple guide 5,the pin 59 while extending transversely is lowered to a position betweenthe side walls 47 and then moved towards the rear end of the stapleguide 5 to thereby move the ends 61 of pin 59 into and along slots 51 tothe depending hook-shaped ends 52 of slots 51 with pin 59 being heldthereby from moving towards the driving throat 8 end of the device. SeeFigure 11. With pin 59 held in the hook-shaped ends 52 of slots 51, thepusher 7 is pivoted clockwise on pin 59 to the upsidedown position shownin Figure 11 and in the latter position, a strip of staples the legs ofwhich can be the same as the heighth of the guide bar 5 can be fed ontoit above the pusher 7. After the staples are loaded, the pusher 7 isthen rotated counterclockwise on pin 59 to its horizontal feedingposition on the staple guide 5 behind the strip of staples S with pin 59being moved upwardly out of the hook-shaped ends 52 to thelongitudinally extending portions of slots 51 to thereby permit thefeeder spring 6 to pull the pusher 7 to thereby feed the staples towardsthe driving throat 8.

The assembled driver 32 is comprised of the following parts. The drivingblade 9 is made from flat sheet metal with its thickness correspondingto the wire gage of the staples being used. A centrally located lug 2!)extends upwardly from the body portion of the driver blades 9 uppermostend and a short distance downwardly from its lug 20 is a smallrectangular shaped hole 65 punched centrally in its body portion. SeeFigures 2 and 12. A lower rectangular shaped flat plate 10 has acentrally located hole 19 close by its one end which is adapted toreceive lug 20 of the driving blade 9 to position the latters ing 20 endvertically above the driving threat 8 and centrally in the device, andplate 10 has lugs 12 which project transversely outwardly a shortdistance from its body portion in line with its hole 19. A centrallylocated lug 66 extends longitudinally towards the rear end of the devicefrom the body portion of plate 10. See Figure 12. An upper plate 11compares substantially in shape to the lower plate 10 and it lieshorizontally flatwise on top of plate 10 with its transversely extendinglugs 13 and its longitudinally extending lug 67 in alignment with lugs12 and lug 66 of plate 10. See Figures 2, 5 and 6. Lugs 12 and 13 ofplates 10 and 11 respectively extend outwardly transversely through anda short distance outwardly beyond slots 14 of head 15 and plates 10 and11 are thereby restrained from moving longitudinally relative to eachother during vertical movement. The sidewardly edges of the bodyportions of plates 10 and 11 move closely along the inwardly sides 17 offlanges 18 of head 15 to prevent sideward movement of plates 10 and 11during their vertical movement in relation to head 15. See Figures 5 and6. A flange 68 is formed upwardly from the one end of the body portionof the upper plate 11 and flange 68 has a small rectangular hole 70pierced centrally therein. The upper plate 11 has two small bosses 69spaced apart and projecting above its uppermost flat surface for reasonsto be explained. See Figures 6 and 12. A spring 71 is made from lightgage flat metal spring stock and it has two holes 72 punched in its bodywhich are adapted to fit over the two bosses 69 of the upper plate 11and lie flatwise against the latter with bosses 69 restraining the bodyportion of the spring 71 from moving about horizontally in relation tothe upper plate 11. Spring 71 has an arm 73 standing upright at rightangle to its horizontally lying body portion which extends close by andlongitudinally along the inwardly side 17 of one of the flanges 18 ofthe head 15. Arm 73 of spring 71 is integrally joined to its bodyportion starting at its rear end by a short longitudinal section alongits sidewardly edge thereby leaving the greater part of the length ofarm 73 free to flex'transversely of the device. See Figures 6, 7 and 12.A short section of the free end of arm 73 is formed transverselyoutwardly at 74 to thereby protrude into one of the slots 14 of head 15.The lower edge of section 74 is formed transversely towards the centerof the device a short distance in line with the horizontally lying bodyportion of spring 71 and then upwardly to form lug 75 with the latterbeing spaced apart from and parallel to arm 73. See Figures 6 and 12. AU-shaped blade retainer 76 is made from flat sheet metal and is adaptedto have its lower leg 77 fit flatwise snugly against the under side oflower plate 10 with its upper leg 78 lying flatwise snugly against theupper side of the body portion of spring 71 to hold it flatwise againstthe uppermost side of the upper plate 11 and into engagement with bosses69. The sidewardly wall 79 of the blade retainer 76 integrally joinslegs 77 and 78 and it extends flatwise transversely a short distanceaway from the edges or" the rear ends of the body portions of plates and11. A hole 33 is pierced centrally in the transversely extendingsidewardly wall 79 of the blade retainer 76 and hole 89 is adapted tofit over lugs 66 and 67 of the plates 10 and 11 to guide the rear end ofthe blade retainer 76 during its longitudinal movement. See Figures 5and 12. A small centrally located lug 81 projects longitudinally fromthe one end of leg 77 of the blade retainer 76 and lug 81 extendsthrough and beyond and. is movable in hole 65 of the driving blade 9 tohold it upwardly against the under side of the lower plate 11). Arounded bump section 32 is formed upwardly at the end of lug 81 torestrain it from freely moving longitudinally out of hole 65. SeeFigures 2 and 12. A small centrally located lug 83 projectslongitudinally from the front end of the upper leg 78 of the bladeretainer 76 and lug 83 extends freely through and beyond hole 79 inflange 63 of the upper plate 11 to guide the front end of the bladeretainer 76 during its longitudinal movement. See Figures 2 and, 12. Alongitudinally extending notch 84 which is open at the front end or" theupper leg 73 provides a flat arm 35 which lies horizontally in line withthe flat body portion of the upper leg 75% of the blade retainer 76 andarm 35 extends longitudinally towards the front end of the latter.Extending from its end longitudinally along the inwardly edge of arm 85of the blade retainer 76 is a short section 86 which terminates in a camedge 87 which extends a very short distance at an an le towards thecenter of the device to a very short longitudinally extending section33. See Figure 12.

A lug J extends transversely outwardly from one end of the sidewardiywall 73 of the blade retainer 76 and lug 39 is in vertical alignmentwith cam edges 42 and 43 on one of the flanges 18 of head 15. The bladeretainer 76 is thereby adapted to be shifted longitudinally back andforth a short distance when it is moved vertically in relation to headand its lug 39 contacts cam edges 42 and 43 of the head 15. See Figures1, 3, 6, 8 and 12. The parts listed above will hereafter be referred toas the assembled driver 32.

As shown in Figure 7, the short section 86 of arm 85 of the bladeretainer 76 lies between the outwardly formed portion 74 and lug 75 ofspring 71 with section 86 in contact with and longitudinally in linewith the outwardly vertical side of lug 75 and further that there is aspace between the outwardly longitudinally extending edge of arm of theblade retainer 76 and arm 73 of spring 71 to allow the free end of arm73 to move transversely towards the center of the device.

in the starting position shown in Figures 1, 5 and 6, a staple S hasbeen fed into position beneath the assembled driver 32, the outwardlyside of the outwardly formed portion 74 of spring 71 is resting againstthe inwardly side 17 of flange 13 at a point directly above theuppermost end of one of the slots 14 of head 15.

By means to be described later, the assembled driver 32 is moveddownwardly a short distance in relation to the magazine 1 to therebypartially eject or drive the staple S and in this lowered position theoutwardly formed portion 74 of spring 71 is moved transversely outwardlyinto slot 14 of head 15 by the flexing action of its arm 73. See Figures2 and 7.

The driving blade 9 of the assembled driver 32 having been lowered ashort amount will thereby block additional staples from being fed intothe driving throat 8 and the uppermost edge of the outwardly formedportion 74 of spring 71 is below and in vertical alignment with theuppermost end of slot 14 of head 15 to thereby obstruct the assembleddriver 32 from moving to its start ing position, upwardly in relation tohead 15 of the magazine 1.

As explained above, the assembled driver 32 cannot be retracted but canand is moved downwardly in relation tojthe head, 15 of the magazine 1 tocompletely drive the staple S with the full throw mechanism operating asfollows: As the assembled driver 32 nears the end of its verticallydownward staple driving movement in relation to head 15 of the magazine1, lug $9 of the blade retainer 76 rubs along the lower cam edge 43 ofthe head 15 to thereby shift the blade retainer 76 longitudinallytowards the front end of the device with cam edge 87 of the blade retainer 76 contacting lug on arm 73 of the spring 71 to thereby move lug75 to rest against section 88 of the blade retainer 76 with outwardlyformed portion 74 of spring 7.1 also being moved transversely inwardlyand thereby out of vertical alignment with the uppermost end of slot1dof head 15 to thereby permit the assembled driver 32 to be movedupwardly in relation to the magazine 1 toits starting position to permitanother staple to be fed into driving position beneath the driving blade9. See Figures 3 and 8.

During upward movement of the assembled driver 32, in relation to themagazine 1, the uppermost edge of the outwardly formed portion 74 ofspring '71 moves past the uppermost end of one of the slots 14 in head15 and the lug 89 of the blade retainer 76 rubs against the cam edge i2of the head 15 to thereby move the blade retainer 76 longitudinallytowards the rear end of the device to thereby position section 86 of theblade retainer 76 transversely in line with and spaced apart from lug 75of spring 71 with the latters portion '74 thereby being flexibly movedtransversely outwardly a slight amount to its starting position againstthe inwardly side 17 of flange 13.

An anvil arm 2 has the usual clincher means 21 fixed at its free end tounderlie the driving channel 8 at the free end of the magazine 1. Therearwardly ends of the anvil arm 2 and the magazine 1 are pivotedtogether to thereby permit movement of their free ends towards eachother to grip material M. The anvil arm 2 is of channel shape having abottom wall 22 which underlies the magazine 1 to act as part of ahand-grip. The bottom wall 22 of the anvil arm 2 has upstandinglongitudinally extending side walls 23 which are suitably spaced apartto adapt them to move close by the vertical outwardly sides of themagazine 1. The side walls 23 of the anvil arm 2 are pierced to receivepin 24 and the anvil arm 2 is thereby pivoted to the magazine frame 1. Ashort distance from pin 24 and extending towards the front end of thestapler, a portion of the side walls 23 of the anvil arm 2 are spaced agreater distance apart to provide narrow transversely confining slots onboth sides of the device which extend vertically longitudinally betweenthe outwardly sides of the vertical flanges 41 of the magazine 1 and theinwardly vertical sides of flanges 23 of the anvil arm 2 to provide aworking space for the flat metal actuating arms 3. The flanges 23 of theanvil arm 2 are notched centrally at their front ends to receivematerial and to form arms 25 which extend upwardly on both sides of thedevice.

Twin flat metal actuating arms 3 fit flatwise and extend longitudinallyin the narrow slots mentioned above, one on each side of the device withtheir centrally located cam edges 30 uppermost and in contact withroller 29 of the hand lever 4. See Figure 1. The actuating arms 3 arepivoted at their rear ends on headless rivets 31 which protrudetransversely outwardly the thickness of arms 3 from the vertical sidewalls 46 of the magazine l and actuating arms 3 are operably connectedat their front ends to the driver assembly 32 for reciprocating thelatter. The elongated longitudinally extending slots 9% at the frontends of actuating arms 3 fit over the transversely extending ends oflugs 12 and 13 of plates 1 and 11 respectively of the assembled driver32 to reciprocate the latter. See Figures 1, 3 and 5.

A hand lever 4 is of inverted U shape having a central portion 33, usedas the balance of a hand-grip, which overlies and is movable towards theupper side of the magazine 1. The central portion 33 of the hand lever 4has depending side flanges 26 which at their front ends straddle theupwardly extending arms 25 of the anvil arm 2. See Figure 4. At theirfront ends the side filanges 26 of the hand lever 4 are pivotallyconnected to the front ends of arms 25 of the anvil arm 2 by rivets 27and flanges 26 are pierced intermediate their ends a short distance fromrivets 27 to receive pin 28. A cam roller 29 is mounted on pin 28 andextends transversely to the inwardly sides of flanges 26 of the handlever 4. See Figures 2 and 4.

It will be noted in Figures 2 and 5, a transversely extending pin 33whose ends are entered in aligned holes in the actuating arms 3 and thatthese holes are located between the latters slots 99 and their cam edges30.

As shown in Figure 2 the retraction spring 34 is pulling the front endsof the actuating arms 3 through pin 33 in an angled upwardly directionand pulling the hand lever 4 through the latters lug 35 in substantiallythe opposite direction to thereby hold the cam edges 30 of the actuatingarms 3 in constant contact with roller 29 of the hand lever 4 andthereby roller 29 is used as a leverage point to thereby force the rearends of the actuating arms 3 in a downwardly direction while urging thehand lever 4 to pivot counterclockwise on rivets 27. As the hand lever 4and the actuating arms 3 are moved in the direction indicated above bythe pull of the refraction spring 34, the hand lever 4 pivotscounterclockwise on rivets 27 and roller 22 is thereby moved upwardly inan arc around rivets 27 with the rear ends of the actuating arms 3through the headless rivets 31 acting to hold the magazine frame 1against the anvil arm 2 while the front ends of actuating arms 3 movethe driver assembly 32 upwardly in relation to the magazine frame 1 tothe limit of slots 14 of the head 15. Continued pull by the retractionspring 34 after the driver assembly 32 is stopped, as explained above,will move the magazine frame 1 and the actuating arms 3 upwardly in onedirection and the anvil arm 2 downwardly in an opposite directionthrough the hand lever 4 and rivets 27 to thereby separate the drivingchannel 8 from the clincher 21 to the position shown in Figure 1. In thelatter position, it will be noted that roller 29 of the hand lever 4 hasbeen settled into the curved notch 37 of the actuating arms 3 and isheld in this position by the pull of the retraction spring 34. As shownin Figure 9, the hand lever 4 has been manually moved counterclockwiseon rivets 27 to a vertically extending position that thereby exposes theupper side of the magazine frame 1 and that roller 29 has been settledinto the retainer notch 36 of the actuating arms 3 and is held in thislatter position by the pull of the retraction spring 34.

In Figure 1, the starting position, the: driver assembly 32 is raised inrelation to the magazine frame 1, thus permitting a staple S to be fedinto the driving throat beneath the driving blade 9, the roller 29 ofthe hand lever 4 is seated in notch 37 of the actuating arms 3 and thefront ends of the magazine 1 and the anvil arm 2 are spaced apart toreceive material M to be stapled. Manual pressure is exerted on handlever 4 and the anvil arm 2 with the following results: the roller 29 ofthe hand lever 4 exerts pressure against the sharply inclined ends 91 ofcam edges 30 of the actuating arms 3 to thereby transmit the appliedpressure along a line extending through the headless rivets 31 of themagazine frame 1 and further to pass horizontally below but close by pin24 with the pressure thus exerted moving the front end of magazine frame1 towards the front end of the anvil arm 2 to grip the material Mtherebetween with roller 29 of the hand lever 4 moving upwardly on thesharply inclined ends 91 of cam edges 30 of the actuating arms 3. Duringthe operation so far, it will be observed from Figures 1 and 2 that thehand lever 4 has pivoted in fastener applying direction clockwise onrivets 27 of the anvil arm 2 a very slight amount while the front endsof the magazine 1 and the anvil arm 2 were moved a considerable distancetowards each other. When the free or front ends of the magazine 1 andthe anvil arm 2 are stopped by contact with material M as shown inFigures 2 and 3 and further pressure is applied to the device, theroller 29 of the hand lever 4 is thereby moved in a downwardly arcclockwise around rivets 27 and longitudinally along cam edges 34) of theactuating arms 3 to thereby progressively shift the extended directionof the applied force away from pin 24 and towards a position between theheadless rivets 31 of the magazine 1 and rivets 27 of the anvil arm 2.See Figures 1, 2 and 3. The roller 29 of the hand lever 4 thus exertspressure in fastener applying direction on the actuating arms 3 at apoint intermediate its ends to force the slots to move the assemleddriver 32 downwardly to drive a staple from the magazine to clinch itagainst the anvil while the rear ends of arms 3 through headless rivets31 forces the front end of the magazine against the upper side of thematerial M with lever 4, through rivets 27 acting to force the front endof anvil arm 2 upwardly to grip the underside of the material. SeeFigure 3.

I claim:

1. In a device of the type indicated, a magazine for holding a supply offasteners and having a throat at one end through which the fasteners aredriven, an actuating arm and a driver carried by said actuating arm forreciprocating said driver in said throat, said actuating arm arranged topermit access to substantially the full length of the upper side of saidmagazine, an anvil arm underlying said magazine for gripping one side ofmaterial and clinching the legs of fasteners, means for pivotallyconnecting the magazine and arms for relative movement, a hand leveroverlying and movable towards and away from the upper side of saidmagazine, means pivotally connecting said hand lever to said anvil armfor moving the latter relative to said magazine, operable connectormeans between said hand lever and said actuating arm for moving thelatter in fastener applying direction when said hand lever is movedtowards the upper side of said magazine, said operable connector meanspermitting said hand lever to move in one direction towards the upperside of said magazine to thereby move said arms relative to the magazineto drive and clinch a fastener and to move in an opposite direction awayfrom overlying the upper side of said magazine to thereby give access tothe latter.

2. A device as claim 1 further characterized by said operable connectormeans constituting an inclined angle cam surface on said actuating armand means on said hand lever movable along said inclined cam surface tothereby accentuate the movement of said arm during the initial movementof said hand lever towards the upper side of said magazine.

3. A device as in claim 2 further characterized by said pivot of saidactuating arm being on said magazine at a point intermediate its ends tothereby transmit a part of pressure applied on said actuating arm bysaid hand lever to said magazine to urge the latter to grip one side ofthe material.

4. A device as claim 1 further characterized by resilient means actingto maintain contact of said operable connection when said hand lever isin position to give access to said magazine.

5. In a device of the type indicated, a magazine for holding a supply offasteners and having a throat at one end through which the fasteners aredriven, an actuating arm and a driver carried by said actuating arm forreciprocating said driver in said throat, an anvil arm underlying saidmagazine for clinching the legs of fasteners and gripping one side ofmaterial, means for pivotally connecting the magazine and the arms forrelative movement, a hand lever overlying and movable towards and awayfrom the upper side of said magazine, means pivotally connecting saidhand lever to said anvil arm for moving the latter towards saidmagazine, operable connector means between said hand lever and saidactuating arm for urging the latter to reciprocate said driver in saidthroat, means in said operable connector means adapted at the beginningof a fastener applying operation to direct manual power applied on saidhand lever to said actuating arm in a direction towards the pivot of theactuating arm and continuing in the same direction towards the pivot ofsaid magazine with said anvil arm to thereby resist pivotal movement ofsaid hand lever in relation to said anvil arm, said means in saidconnector means permitting the point of contact on said hand lever toshift in relation to the point of contact on said actuating arm as saidhand lever is moved in fastener applying direction towards the upperside of said magazine to thereby progressively shift the direction ofsaid manual pressure away from its initial direction and progressivelytowards a point between the pivot of the magazine and the magazinedriving throat to thereby greatly increase the leverage advantage ofsaid 10 hand lever during movement of the latter in fastener applyingdirection.

References Cited in the file of this patent UNITED STATES PATENTS2,218,934 Germain Oct. 22, 1940 2,267,719 Crosby Dec. 30, 1941 2,275,548Olsen Mar. 10, 1942 2,354,760 Lindstrom Aug. 1, 1944 2,438,713 MaynardMar. 30, 1948 2,580,505 Balma Jan. 1, 1952 2,625,681 Boroughs Jan. 20,1953

